Power On Systems Check For The Fibre Channel Hub; Type 3523 Fibre Channel Hub - IBM TotalStorage DS4000 Hardware Maintenance Manual

Fibre channel products that are commonly interconnected to the fibre channel hub
are fibre channel host bus adapters, FC-AL storage devices, and FC-AL storage
arrays. SCSI initiators (workstations and servers) set up and initiate the transfer of
data to or from the storage devices. The storage devices that receive the requests
made by the SCSI initiators are the SCSI targets. Initiators and targets represent
individual nodes that are linked by the shared FC-AL. See Figure 4.
Figure 4. Type 3523 fibre channel hub

Power on systems check for the fibre channel hub

Power on the storage modules first, then the controller and the fibre channel hub,
then everything else.
Note: Make sure the fibre channel hub is powered on before the host adapter to
Perform the following steps to insure proper operation of the fibre channel hub:
1. Connect the power cord to the fibre channel hub, then to the electrical outlet.
Figure 5. Type 3523 fibre channel hub power connector
2. Power on the attached FC-AL compatible nodes.
3. Check the Device Active (green) LEDs on the fibre channel hub ports. See
6
IBM TotalStorage DS4000: Hardware Maintenance Manual
insure proper loop initialization.
See Figure 5.
Power Connector
Figure 6 on page 7.